My own mom, she-who-raised-nine-children, turned 90 this month. When you say 90 is sounds like a lot. But when you say 9 x 10 years it doesn't really sound like very much at all. I mean, look at how fast the last 10 years have gone. And the 10 years before that! And how is it that in some ways I still feel like a little family starting out and at the same time there are college catalogs arriving daily for my eldest? In the words of my mom, and someone else who said it first, "Time flies like the wind. Fruit flies like bananas." Which to me means, you can try to make it sense of it all and make sense of our time here on earth but really, it's hard. So when we can't make sense, at least we can take notice.
If you don't believe me that time flies and that things are always changing, I offer the photo here as proof.